/* eslint-disable 
/* 注意：包含echarts的仅支持横向打印
      如果打印的涉及echarts，一定要这么使用
      this.loading = true; //将所在div加个loading，因为实现原理是重新新建一个图片，然后在打印弹窗消失时再把这个新出来的图片关掉。来实现echarts打印出来的效果可控
      setTimeout(() => {
        let arr = document.getElementsByClassName("isNeedRemove"); //即移除新建的图片
        arr.forEach(res => {
          res.remove();
        });
        this.loading = false;
      }, 2000);                                                    //因为定时器属于微任务，需要在整体宏任务执行完毕后更新，所以可以巧妙的在弹出打印弹窗时能一直处于loading状态，否则用户看见了新生成的图片影响体验
      this.$nextTick(() => {
        let arr = document.getElementsByClassName("isNeedRemove");
        arr.forEach(res => {
          res.remove();
        });
        console.log(arr);
      });
*/
const Print = function(dom, options) {
  if (!(this instanceof Print)) return new Print(dom, options);

  this.options = this.extend(
    {
      noPrint: ".no-print"
    },
    options
  );

  if (typeof dom === "string") {
    this.dom = document.querySelector(dom);
  } else {
    this.isDOM(dom);
    this.dom = this.isDOM(dom) ? dom : dom.$el;
  }

  this.init();
};
Print.prototype = {
  init: function() {
    var content = this.getStyle() + this.getHtml();
    this.writeIframe(content);
  },
  extend: function(obj, obj2) {
    for (var k in obj2) {
      obj[k] = obj2[k];
    }
    return obj;
  },

  getStyle: function() {
    var str = "",
      styles = document.querySelectorAll("style,link");
    for (var i = 0; i < styles.length; i++) {
      str += styles[i].outerHTML;
    }
    str +=
      "<style>" +
      (this.options.noPrint ? this.options.noPrint : ".no-print") +
      "{display:none;}</style>";
    // 去除height：100%样式，解决分页下，样式混乱问题
    str += "<style>html,body,div{height: auto!important;}</style>";

    return str;
  },

  getHtml: function() {
    // const widthArr = ['14.285%', '14.285%', '14.285%', '14.285%', '14.285%','14.285%','14.285%'];
    //   // const widthArr = ['142px', '142px', '142px', '142px','142px','142px','142px'];
    //   const tables = document.getElementById('tablePrint').getElementsByTagName('table'); //获取打印的表格
    //   const headcolgroupCol = tables[0].getElementsByTagName('colgroup')[0].getElementsByTagName('col');
    //   const headcolgroupCol1 = tables[1].getElementsByTagName('colgroup')[0].getElementsByTagName('col');
    //   tables[0].style.width = '100%';
    //   tables[1].style.width = '99.995%';
    //   widthArr.forEach((val, index) => {
    //     headcolgroupCol[index].width = val;
    //     headcolgroupCol1[index].width = val;
    //   })
    //通过标签修改指定下载样式
    var inputs = document.querySelectorAll("input");
    var textareas = document.querySelectorAll("textarea");
    var selects = document.querySelectorAll("select");
    var canvass = document.querySelectorAll("canvas");
    var table = document.querySelectorAll("#tablePrint");
    for (var k = 0; k < inputs.length; k++) {
      if (inputs[k].type == "checkbox" || inputs[k].type == "radio") {
        if (inputs[k].checked == true) {
          inputs[k].setAttribute("checked", "checked");
        } else {
          inputs[k].removeAttribute("checked");
        }
      } else if (inputs[k].type == "text") {
        inputs[k].setAttribute("value", inputs[k].value);
      } else {
        inputs[k].setAttribute("value", inputs[k].value);
      }
    }

    for (var k2 = 0; k2 < textareas.length; k2++) {
      if (textareas[k2].type == "textarea") {
        textareas[k2].innerHTML = textareas[k2].value;
      }
    }

    for (var k3 = 0; k3 < selects.length; k3++) {
      if (selects[k3].type == "select-one") {
        var child = selects[k3].children;
        for (var i in child) {
          if (child[i].tagName == "OPTION") {
            if (child[i].selected == true) {
              child[i].setAttribute("selected", "selected");
            } else {
              child[i].removeAttribute("selected");
            }
          }
        }
      }
    }

    //canvass echars图表转为图片
    for (var k4 = 0; k4 < canvass.length; k4++) {
      var imageURL = canvass[k4].toDataURL("image/png");
      var img = document.createElement("img");
      img.src = imageURL;
      img.setAttribute("style", "max- 100%;");
      img.style.width = canvass[k4].offsetWidth * 0.66 + "px";
      // img.style.width = "100px";
      // img.style.height = 740 + "px";
      console.log(
        "很重要！！！",
        canvass[k4].offsetWidth,
        canvass[k4].clientWidth
      );
      // img.style.height = canvass[k4].offsetHeight+'px';
      img.className = "isNeedRemove";
      // canvass[k4].style.display = 'none'
      // canvass[k4].parentNode.style.width = '100%'
      // canvass[k4].parentNode.style.textAlign = 'center'
      canvass[k4].parentNode.insertBefore(img, canvass[k4].nextElementSibling);
    }
    //el-table打印转为图片
    for (var k5 = 0; k5 < table.length; k5++) {
      const tables = table[k5].getElementsByTagName("table"); //获取打印的表格
      const headcolgroupCol = tables[0]
        .getElementsByTagName("colgroup")[0]
        .getElementsByTagName("col");
      const headcolgroupCol1 = tables[1]
        .getElementsByTagName("colgroup")[0]
        .getElementsByTagName("col");
      const widthArr = [];
      let percent = (100 / headcolgroupCol1.length - 0.005).toFixed(3);
      for (let index = 0; index < headcolgroupCol1.length; index++) {
        widthArr.push(percent + "%");
      }
      tables[0].style.width = "100%";
      tables[1].style.width = "100%";
      // tables[1].style.width = percent* headcolgroupCol1.length+'%';
      console.log(widthArr);
      widthArr.forEach((val, index) => {
        headcolgroupCol[index].width = val;
        headcolgroupCol1[index].width = val;
      });
    }
    // 包裹要打印的元素
    // fix: https://github.com/xyl66/vuePlugs_printjs/issues/36
    // return this.wrapperRefDom(this.dom).outerHTML;
    return this.dom.outerHTML;
  },
  // 向父级元素循环，包裹当前需要打印的元素
  // 防止根级别开头的 css 选择器不生效
  wrapperRefDom: function(refDom) {
    let prevDom = null;
    let currDom = refDom;
    while (currDom && currDom.tagName.toLowerCase() !== "body") {
      if (prevDom) {
        let element = currDom.cloneNode(false);
        element.appendChild(prevDom);
        prevDom = element;
      } else {
        prevDom = currDom.cloneNode(true);
      }

      currDom = currDom.parentElement;
    }

    return currDom.tagName.toLowerCase() === "body" ? currDom : prevDom;
  },

  writeIframe: function(content) {
    var w,
      doc,
      iframe = document.createElement("iframe"),
      f = document.body.appendChild(iframe);
    iframe.id = "myIframe";
    //iframe.style = "position:absolute;0;height:0;top:-10px;left:-10px;";
    iframe.setAttribute(
      "style",
      "position:absolute;0;height:0;top:-10px;left:-10px;"
    );
    w = f.contentWindow || f.contentDocument;
    doc = f.contentDocument || f.contentWindow.document;
    doc.open();
    doc.write(content);
    doc.close();
    var _this = this;
    iframe.onload = function() {
      _this.toPrint(w);
      setTimeout(function() {
        document.body.removeChild(iframe);
      }, 100);
    };
  },

  toPrint: function(frameWindow) {
    try {
      setTimeout(function() {
        frameWindow.focus();
        try {
          if (!frameWindow.document.execCommand("print", false, null)) {
            frameWindow.print();
          }
        } catch (e) {
          frameWindow.print();
        }
        frameWindow.close();
      }, 10);
    } catch (err) {
      console.log("err", err);
    }
  },
  isDOM:
    typeof HTMLElement === "object"
      ? function(obj) {
          return obj instanceof HTMLElement;
        }
      : function(obj) {
          return (
            obj &&
            typeof obj === "object" &&
            obj.nodeType === 1 &&
            typeof obj.nodeName === "string"
          );
        }
};
const MyPlugin = {};
MyPlugin.install = function(Vue, options) {
  // 4. 添加实例方法
  Vue.prototype.$print = Print;
};
export default MyPlugin;
